Comtech EF Data SMS-758 - Manual (Page 100)

Theory of Operation SMS-758 Modem Protection Switch
4–40 MN/SMS758 Rev. 3
4.6.7.2 Operation
When configuring the modem setup on the front panel, use the terrestrial type (G.703
15-pin D, V.35 34-pin, RS-422 37-pin D) for the interface selection. Refer to Figures 4-
16 and 4-17 for diagrams, and Tables 4-7 and 4-8 for jumper tables describing how to set
the jumpers for using each interface type.
Note: This interface cannot be used in conjunction with any Interface switch modules
that only support 1 backup. These include the AS/0895 and AS/0896 IDR modules.
Please check the rear of the switch and verify none of the interface switch modules are
the AS/0895 or AS/0896 assembly.
4.6.7.3 Connector Pinouts
The 2:N IBS interface uses a 50-pin female D connector. Screw locks provide
mechanical security of the mating connector.
Signal Function Name Pin #
Ground GND 1, 2
T1/E1 Send Data T1E1_SD-A
T1E1_SD-B 34
18
T1/E1 Receive Data T1E1_RD-A
T1E1_RD-B 36
20
External Clock IN EXC-A
EXC-B 35
19
RS422/V.35 Send Data SD-A
SD-B 37
38
RS422/V.35 Receive Data RD-A
RD-B 39
40
ESC TX Data TXESCDAT 5
ESC RX Data RXESCDAT 7
RS422/V.35 Receive Timing SCR/RTA
SCR/RTB 23
24
RS422/V.35 Transmit Timing SCT/STA
SCT/STB 21
22
RS422/V.35 Terminal Timing SCTE/TTA
SCTE/TTB 12
13
RS422 Transmit Octet R422TXOA
R422TXOB 14
15
RS422 Receive Octet R422RXOA
R422RXOB 8
9
RS422/V.35 Request to Send RTSA
RTSB 45
29
V.35 Data Set Ready V.35_DSR 41
RS422/V.35 Clear To Send CTSA
CTSB 47
31
RS422/V.35 Data Set Ready DSR/DMA
DSR/DMB 48
32
RS422/V.35 Receiver Ready RR/RLSDA
RR/RLSDB 46
30